In this Oct. 21, 2014 photo, giant lock gates are stored along the waterway in Panama for a third lane in the Panama Canal. The expansion project on the century-old canal is expected to be finished in late 2015 or in 2016.

In this Oct. 21, 2014 photo, giant lock gates are stored along the waterway in Panama for a third lane in the Panama Canal. The expansion project on the century-old canal is expected to be finished in late 2015 or in 2016. (Joe Kafka, Associated Press)

In this Oct. 23, 2014 photo, cruise ship Capt. Ronny Borg, a native of Sweden, explains how the control panel works on the bridge of Norwegian Sun on a cruise in Panama. Borg said he has transited the Panama Canal about 20 times and never tires of it.

In this Oct. 23, 2014 photo, cruise ship Capt. Ronny Borg, a native of Sweden, explains how the control panel works on the bridge of Norwegian Sun on a cruise in Panama. Borg said he has transited the Panama Canal about 20 times and never tires of it. (Joe Kafka, Associated Press)

In this Oct. 21, 2014 photo, electric locomotives, called "mules," guide a ship through a Panama Canal lock. Ships pull through the locks under their own power, and the mules keep them centered by attaching cables to each side.

In this Oct. 21, 2014 photo, electric locomotives, called "mules," guide a ship through a Panama Canal lock. Ships pull through the locks under their own power, and the mules keep them centered by attaching cables to each side. (Joe Kafka, Associated Press)